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Field features and petrography used as indicators for the classification of Shigar valley pegmatites, Gilgit-Baltistan region of Pakistan

Author(s)
M. Tahir Shah National centre of Excellence in Geology, University of Peshawar, Peshawar, PAKISTAN
Tahseenullah Khan Department of Earth & Environmental Sciences, Bahria University, Islamabad, PAKISTAN
M. Hassan Agheem Centre for Pure & Applied Geology, University of Sindh, Jamshoro, PAKISTAN
Amanullah Laghari Centre for Pure & Applied Geology, University of Sindh, Jamshoro, PAKISTAN
Humaira Dars Centre for Pure & Applied Geology, University of Sindh, Jamshoro, PAKISTAN
Abstract
On the basis of field features and petrography, Shigar valley pegmatites are classified broadly into Group-I and Group-II pegmatites. The Group-I pegmatites are further divided into muscovite-schorl-beryl-garnet pegmatites and muscovite-schorl pegmatites. The muscovite-schorl-beryl-garnet pegmatites are more productive for gemstones. The Group-II pegmatites are classified as biotite ± garnet ± muscovite pegmatites and muscovite-biotite ± garnet pegmatites. The complete absence of biotite and the higher percentage of muscovite in the gemstone bearing class of pegmatites can be used as indicators for gemstone exploration.
Publication Details
Page(s) 1-7
DOI DOI not available
Published Journal: Journal of Himalayan Earth Sciences, Volume: 44, Issue: 2, Year: 2011

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